Merge pull request #2 from mnalis/master

getbeu16(), MID 0x09 za demo
Merge branch 'master' of https://github.com/hrvach/gsd4t_parser
LEAD-IN of 0x85xx is (sometimes multiple) part of SiRFbinary MID 8 (0x08) - 50 BPS data subframe, extract leap-second from this